Year	Number
1996	40.7035179138184
1998	41.5
2000	30.8457717895508
2002	46.766170501709
2003	44.7761192321777
2004	35.5769233703613
2005	31.1004791259766
2006	33.4928245544434
2007	30.6220092773438
2008	25.480770111084
2009	21.8009471893311
2010	26.5402851104736
2011	26.7605628967285
2012	26.2910804748535
2013	31.9248828887939
2014	33.1730766296387
2015	34.2857131958008
2016	26.1904754638672
2017	22.8571434020996
2018	22.380952835083
2019	22.380952835083
2020	20.4761905670166
2021	21.4285717010498
2022	18.3962268829346